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Measurement of the τ-lepton mass with the Belle II experiment

Publikace na Matematicko-fyzikální fakulta |
2023

Tento text není v aktuálním jazyce dostupný. Zobrazuje se verze "en".Abstrakt

We present a measurement of the τ-lepton mass using a sample of about 175 million eþe− → τþτ− events collected with the Belle II detector at the SuperKEKB eþe− collider at a center-of-mass energy of 10.579 GeV. This sample corresponds to an integrated luminosity of 190 fb−1.

We use the kinematic edge of the τ pseudomass distribution in the decay τ− → π−πþπ−ντ and measure the τ mass to be 1777.09  0.08  0.11 MeV=c2, where the first uncertainty is statistical and the second systematic. This result is the most precise to date.